Carol Danvers (Brie Larson), the "Captain Marvel", has taken back her identity from the brutal Kree and exacted revenge on the Supreme Intelligence. However, unexpected consequences have occurred. Faced with a turbulent and fragile universe, she resolutely stepped forward. While on a mission, she came to a mysterious special wormhole. Here, she became entangled with two other heroines - Kamala Khan (Iman Vellani), a super fan of Captain Marvel from Jersey City, and Captain Marvel, and Captain Monica Rambeau (Teyonah Parris), a little niece who used to be close to Carol and now grew up as an astronaut in S.W.O.R.D. The three seemingly unrelated people must work together to save the universe as the "Marvel Alliance".